Lions Burfict, Chris Polk, Case Keenum among notable UDFAs

The 2012 NFL draft came to an end at 7:20 p.m. ET on Saturday, when the Indianapolis Colts made Northern Illinois quarterback Chandler Harnish this year’s Mr. Irrelevant. NFL teams have already begun contacting and agreeing to terms with undrafted free agents. Here are the notables: 1. Arizona State linebacker Vontaze Burfict — Troubled but…